I stay at Mr Supot appartement at Sukhumvit soi 15 for three nights, the place is really nice, big and clean, more than enough for six people.
The host is really nice as well, really helpful with any information that I need, and easy to contact him via whattsapp.
But the place is a bit far from BTS/MRT station by walking, but still you can reach it via tuk-tuk or taxi that easy to find in front of the appartement.
It was really nice to stay there.
Thank you Mr. Supot :)